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| author | Eric Dumazet <edumazet@google.com> | 2013-06-15 03:30:10 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-19 23:06:52 -0700 |
| commit | c9364636dcb01a6fc37ca2c6a51c5aa0c663013c (patch) | |
| tree | 4ea94902a65b0f3ca46ec82652da39b0dea59d55 /net/ipv4 | |
| parent | bcefe17cffd06efdda3e7ad679ea743236e6271a (diff) | |
| download | blackbird-op-linux-c9364636dcb01a6fc37ca2c6a51c5aa0c663013c.tar.gz blackbird-op-linux-c9364636dcb01a6fc37ca2c6a51c5aa0c663013c.zip | |
htb: refactor struct htb_sched fields for performance
htb_sched structures are big, and source of false sharing on SMP.
Every time a packet is queued or dequeue, many cache lines must be
touched because structures are not lay out properly.
By carefully splitting htb_sched in two parts, and define sub structures
to increase data locality, we can improve performance dramatically on
SMP.
New htb_prio structure can also be used in htb_class to increase data
locality.
I got 26 % performance increase on a 24 threads machine, with 200
concurrent netperf in TCP_RR mode, using a HTB hierarchy of 4 classes.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
0 files changed, 0 insertions, 0 deletions
